Produced by the extrusion of high-silica rhyolite lava, perlite is a light-grey, glassy rock, with a pearly lustre and concentric fracture.  Its physical and chemical properties enable it to be used in many applications such as  filtration and horticulture, although the majority of perlite is used in formed construction products such as pipe, roof, and board insulation. Information in this article is included on  occurrence, production, applications (both crushed and expanded), pricing and market outlook. 

Note - further information on the characteristics of perlite can be found on the website of the Perlite Institute world trade organisation.

Primary author(s): Albatici R; Di Bella A; Fausti P; Frattari A; Nicosia G;                       

Source: Ind.Miner.

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